Apex domains cannot have CNAME records.
Question and response
Question
dig textosbreves.com. NS
Answer
textosbreves.com. 5 NS ns1.textosbreves.com.
textosbreves.com. 5 NS ns2.textosbreves.com.
Authority
The response has no authority records.
Additional
ns1.textosbreves.com. 5 A 51.79.42.52
ns2.textosbreves.com. 5 A 184.107.143.110
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0